Drill for oil or other wells.



Nn. 711,506. Patented uct. 2|, |902.

w.` E. JOHNSTON. A

DRILL FOR OIL 0B OTHER WELLS.

{Application tiled Aug. 28, 1901.)

(No Model.)

w; mms Prens zo, worauwo., wAsHmmoN. nv cy UNITED STATES PATENT OFFICE.

WILLIAM E. JOHNSTON, OF CONOQUENESSING, PENNSYLVANIA.

DR|LL FOR OIL OR OTHER WELLS.

SPECIFICATION forming part of Letters Patent No. 711,506, dated October21, 1902. Application led August 23, 1901. Serial No. 73,064. (No modelothe like below the casings thereof, the object of my invention being toprovide a tool which may be readily operated by an oil-Well rig of thetype commonly employed and which is efficient in enlarging the cavity ofan oil or wa- 'ter well when it is necessary to do so in order toincrease the ow.

My invention consists in the peculiar construction and combination ofdevices hereinafter fully set forth and claimed.

In the accompanying drawings, Figure 1 is partly au elevation and partlya vertical sectional view of a drill embodying my improvements, showingthe same in operative position in an oil-well in enlarging the cavitythereof below the casing. Fig. 2 is a similar view of a modied form ofmy improved drill.

My improved drill consists, essentially, of the head or body 1 and thepick-arms,the latter having their upper ends pivotally connected to thehead at opposite sides of the latter, as at 3, and having their lowerends beveled on their inner sides to form Vthe points 4, the bevels 5 ofthe said pick-arms being opposed to each other. As here shown, the heador body 1 is provided with a number of circular flanges 6, the diameterof which is slightly less than the interior diameter of the wellcasinga. The upper portions of the pickarmsare disposed in mortises l, thelower and outer sides of which are open and the inner sides 1b of whichare vertical and parallel with each other, so that the pick-arms areadapted to lie in a vertical position parallel with each other, as shownin Fig. 2, and within the radius of the head or body. At the upper endof the head or body is a screw-studadapted to be reciprocated in avertical direction, and being lowered in the well-casing to theoil-bearing sand of an oil-well at a point below the casing by beingmoved alternately upwardly and downwardly the pick-arms as they descendwill by the impact of their inclined surfaces 5 at their lower endsagainst the sand be forced outwardly, with the result that on thedownstrokes of the drill the lower cutting edges of the pick-armsthereof will operate on the walls of the cavity to enlarge the saidcavity, as will be readily understood. This the lsimplest form of myinvention is shown in Fig. 2.

To adapt the pick-arms to be expanded or moved outwardly from each otherat their lower ends on the downstrokes of the drill when the drill isoperated in the oil or water in the well, I provide'a cylinder 8, theupper end of which is detachably secured to a stud 9, that depends fromthe lower side of the body l between the picker-arms. rIhe lower end ofthe said cylinder is open, and in the said cylinder operates a plunger10. The cylinder is provided with slots 1l of suitable length inopposite sides thereof, and links l2 have their lower ends pivotallyconnected to the said plunger and their upper ends pivotally connectedtothe pick-arms, said links passing' through and operating in the slots11. The pins 13, which connect the upper ends of said links to thepick-arms, are removable from the latter to enable the said links to bedisconnected therefrom.

The operation of my invention when thus organized, as shown in Fig. 1,is as "follows: On each downstroke of the drill the plunger is forcedupwardly inV the piston by the impact thereof on the oil or water in thewell. The power of the said plunger is imparted to the pick-arms by thelinks 12, and thereby the pick-arms have their lower ends, which operateon the sides or walls of the cavity, spread apart, hence enlarging thediameter of the said cavity. It will be understood that on each upstrokeof the drill the picker-arms are disposed by their own gravity and bythe contact of their outer sides with the wellcas ing in the parallelposition, (shown in Fig. 2,) so that the drill may readily be movedupwardly in the casing.

Having thus described my invention, I claim- 1. In a reciprocatingdrill, the combination IOO of a head or body portion, pivoted pick-armsextending downwardly from said head or body portion, a cylinder, meansto detachably oonneot it to the head or body portion so that thecylinder will depend therefrom, a plunger in the cylinder, linksconnected to the plunger and means to detaehnblyoonneet the links to thepivoted piok-arrns, substantially as described.

2, In a reciprocating drill, the combination of a head or body portionhaving a depending cylinder, pivoted piek-arms extending downwardly fromsaid head or body portion, a plunger in said cylinder and linksconnecting said plunger to said piek-arms, substantially l5 asdescribed.

In testimony that I claim the foregoing as my own I have hereto aflixedmy signature in the presence of two witnesses.

WILLIAM E. JOHNSTON.

Witnesses:

E. H. HU'roHIsoN, S. W. LOBAUGH.

